MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Why do we divide the temperature-enthalpy relationship of a mixture into zones? |
| A. | To calculate LMTD for each zone |
| B. | To calculate Tsat – TLIQUID for each |
| C. | To calculate resistance for each |
| D. | To make the solving process easier |
| Answer» B. To calculate Tsat – TLIQUID for each | |
| 2. |
The temperature-enthalpy relationship of a mixture represents the coolant flow in __________ |
| A. | Single phase |
| B. | Double phase |
| C. | Triple phase |
| D. | Any phase possible |
| Answer» B. Double phase | |
| 3. |
Which one of the following bold line represents the coolant line in the temperature-enthalpy relationship of a mixture? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 4. |
Which one of the following statement is correct about the temperature-enthalpy relationship of a mixture? |
| A. | Sub-cooled at the entrance |
| B. | Sub-heated at the entrance |
| C. | Superheated at the entrance |
| D. | Superheated at the exit |
| Answer» D. Superheated at the exit | |
| 5. |
In condensation from mixtures, with or without a non-condensing gas, the assumptions underlying the logarithmic mean temperature difference (LMTD) are invalid, so what is the method that we can adopt to cope with this problem? |
| A. | Zonal Distribution |
| B. | Taking linear groups of enthalpy curves for LMTD calculations |
| C. | Apply LMTD anyway |
| D. | Apply average LMTD |
| Answer» C. Apply LMTD anyway | |
| 6. |
In condensation from mixtures, with or without a non-condensing gas, then the assumptions underlying the logarithmic mean temperature difference (LMTD) are valid. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
The thermal design of condenser is therefore considerably ___________ than that of a single-phase heat exchanger. |
| A. | Same |
| B. | More complicated |
| C. | Less complicated |
| D. | Not relatable |
| Answer» C. Less complicated | |
| 8. |
With condensation occurring in fluid mixtures which might be having a non-condensing gas, the variation of the equilibrium temperature with enthalpy can be a _________ function. |
| A. | Linear |
| B. | Non-Linear |
| C. | Quadratic |
| D. | Parabolic |
| Answer» C. Quadratic | |
| 9. |
If the coolant is single-phase, and if the overall heat transfer coefficient is reasonably constant, then the formula for the area of the condenser can be ________ |
| A. | A=\(\dot{Q}/U \Delta T_{LMTD} \) |
| B. | A=\(\dot{Q}/U \Delta T_{LMTD} \) |
| C. | A=\(\dot{Q}/U \Delta T_{LMTD} \) |
| D. | A=\(\dot{Q}/U \Delta T_{LMTD} \) |
| Answer» C. A=\(\dot{Q}/U \Delta T_{LMTD} \) | |
| 10. |
If the coolant is not in multiple-phase, and if the overall heat transfer coefficient is constant, then the assumptions underlying the logarithmic mean temperature difference (LMTD) __________ |
| A. | Are Valid |
| B. | Are Invalid |
| C. | Not all but some are valid |
| D. | Single assumption invalid |
| Answer» B. Are Invalid | |